A rank 2 characterization of twinnings
by Bernhard Mühlherr.
Abstract:
We show that a non-empty relation between the chambers
of two buildings of the same type is the opposition relation
of a twinning as soon as this holds for all its restrictions
on opposite rank 2 residues.
Key words and phrases:
Twin buildings, Opposition relation.
1991 Mathematics Subject Classification: 51E24 .
Published in: European Journal of Combinatorics
Contact: Bernhard.Muehlherr@Mathematik.Uni-Dortmund.DE